With the exception of Elven Chain-mail and robes, any torso armour will prevent spellcasting. Thief skills are disabled if u wear anything heavier than Studded Leather Armour.
Also worth noting, thieving skills are sometimes "hidden" (depending on class or multi-class) behind the skills button on the right side of the bottom bar.
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With the exception of Elven Chain-mail and robes, any torso armour will prevent spellcasting. Thief skills are disabled if u wear anything heavier than Studded Leather Armour.